AVS 49th International Symposium
    Thin Films Wednesday Sessions
       Session TF-WeP

Paper TF-WeP6
Fabrication of CuIn@sub 1-x@Ga@sub x@Se@sub 2@ Thin Film Solar Cells by Two-step Process

Wednesday, November 6, 2002, 11:00 am, Room Exhibit Hall B2

Session: Poster Session
Presenter: H.K. Song, Seoul National University, Korea
Authors: H.K. Song, Seoul National University, Korea
S.G. Kim, Kyungwon University, Korea
H.J. Kim, Seoul National University, Korea
S.K. Kim, Korea Institute of Energy Research, Korea
K.H. Yoon, Korea Institute of Energy Research, Korea
Correspondent: Click to Email
Photovoltaic (PV) modules based on CuIn@sub 1-x@Ga@sub x@Se@sub 2@ polycrystalline thin films have been promising candidates as an effective absorber material for solar cells. It has been reported that solar efficiency over 17% by co-evaporation of elemental sources (Cu, In, Ga, and Se) through three-stage process. But this process is difficult to scale-up for a large-manufacturing system. So we prepared CuIn@sub 1-x@Ga@sub x@Se@sub 2@ thin films by 2-step process that can be easily scaled-up to industrial process. Metallic precursors were deposited on Mo coated soda-lime-silicate glass by DC magnetron sputtering followed by selenization process using Se vapor in an evaporation system. Ga was incorporated by using a Cu-Ga(23 at.%) alloy target. CdS buffer layer, intrinsic and n-type ZnO layer and Al top contact electrode were deposited by CBD (chemical bath deposition), RF sputtering system, and E-beam evaporator system, respectively. Fabricated CuIn@sub 1-x@Ga@sub x@Se@sub 2@ thin film solar cells have relatively smooth surface morphology and mono-crystalline chalcopyrite phase. The efficiency of solar cell are measured by solar simulator and the characteristics of CuIn@sub 1-x@Ga@sub x@Se@sub 2@ films are analyzed by X-ray diffraction (XRD), Auger Electron Spectroscopy (AES), Electron Probe Micro Analysis (EPMA), and Field Emission Scanning Electron Microscope (FESEM).